3G上網 - Linux

環境是 arm-linux (ubuntu)

在 device 上裝上 3G網卡(UC20)，kernel也有抓到。接著在編輯

etc/ppp/peers/Module-UC20, /etc/ppp/peers/Chat-Module-UC20-connect,

etc/ppp/peers/Chat-Module-UC20-disconnect.

最後執行 pppd call Module-UC20出現以下訊息
=========================================================================

root@ubuntu-armhf:/# pppd call Module-UC20
abort on (NO CARRIER)
abort on (ERROR)
abort on (NO DIALTONE)
abort on (BUSY)
abort on (NO ANSWER)
send (AT^M)
send (ATE0^M)
expect (OK)
^M
OK
-- got it

send (ATD*99#^M)
expect (CONNECT)
^M
^M
OK^M
^M
CONNECT
-- got it

send (^M)
Script chat -s -v -f /etc/ppp/peers/Chat-Module-UC20-connect finished (pid 1597), status = 0x0
Serial connection established.
using channel 3
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB3
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xbd8ec2> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <auth chap MD5> <magic 0x259267f> <pcomp> <accomp>]
sent [LCP ConfAck id=0x2 <asyncmap 0x0> <auth chap MD5> <magic 0x259267f> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xbd8ec2> <pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0xbd8ec2]
rcvd [LCP DiscReq id=0x3 magic=0x259267f]
rcvd [CHAP Challenge id=0x1 <1429c17f92217062ba2aacaf70732950>, name = "UMTS_CHAP_SRVR"]
sent [CHAP Response id=0x1 <dfb382700007423dc6159a5a88da59af>, name = "bernie"]
rcvd [LCP EchoRep id=0x0 magic=0x259267f 00 bd 8e c2]
rcvd [CHAP Success id=0x1 ""]
CHAP authentication succeeded
CHAP authentication succeeded
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
rcvd [proto=0x3] 01 00 04
Unsupported protocol 0x3 received
sent [LCP ProtRej id=0x2 00 03 01 00 04]
Modem hangup
Connection terminated.

==============================================================================

感覺在最後倒數六行 IPCP 這個 protocol 怪怪的，是對方 server 沒支援嗎?

3G一直無法連線 Modem hangup，求方向...謝謝。

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